Munson Health
 
Crab Lice

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by Hellwig J

(Pubic Lice; Pediculosis Pubis)

 

Treatment

Over-the-counter shampoo or cream rinse containing permethrin or pyrethrins are used to treat pubic lice.
Some lice may be resistant to treatment above. For resistant cases, your doctor may recommend:
  • Malathion—a prescription topical medicine approved only for patients older than 6 years
  • Lindane—a prescription topical medicine.
    • NOTE: Lindane should only be prescribed to patients who are unable to take other medications or who have not responded to them. According to the Food and Drug Administration’s warning, lindane can rarely cause serious side effects, including seizure and death. Those especially susceptible are infants, the elderly, children and adults weighing under 110 lbs, and individuals with other skin conditions. It should also not be used in pregnant or lactating women or in people who have uncontrolled seizures. Lindane is a toxin and should not be overused. Patients are given small amounts (1-2 oz) of the shampoo or lotion and instructed to apply a very thin layer and not to reapply.
  • Ivermectin—a medicine given by mouth. It cannot be used in pregnant or lactating women.
Recommended treatment steps:
  • Wash the infested area. Towel dry.
  • Thoroughly saturate hair with lice medication. Follow the package instructions carefully. Leave the medicine in the hair for the recommended amount of time, not longer.
  • Remove the medicine from the hair as instructed on the package.
  • Following treatment, most lice eggs will still be attached to hair shafts. You can remove them with your fingernails or a comb.
  • Put on clean underwear and clothing after treatment.
  • If you have lice in your eyebrows or eyelashes, you may be directed to coat the area with a prescription petroleum jelly. If only a few lice or eggs or present, it may be possible to remove these with a nit comb or your fingernails.
  • Kill any lice and nits on clothing or bedding. Wash any items used during the 2-3 days before treatment. Use the hot water cycle (130°F) [54°C] of the washing machine. Use the hot cycle of the dryer to dry clothes.
  • Dry clean clothing that is not washable.
  • Avoid sexual activity until partners have been treated.
  • If necessary, treat again in 7-10 days.
 

RESOURCES

American Academy of Dermatology
http://www.aad.org

American College of Obstetrics and Gynecology
http://www.acog.org

 

CANADIAN RESOURCES

Communicable Disease Control (CDC) Network
Province of Manitoba
http://www.gov.mb.ca/health/publichealth/cdc/index.html

Health Canada
http://www.hc-sc.gc.ca

 

References


Behrman RE, Jensen HB, Nelson WE, Kleigman RM. Nelson Textbook of Pediatrics . 18th ed. Philadelphia, PA: Saunders Elsevier; 2007.


Centers for Disease Control and Prevention. Sexually Transmitted Diseases Treatment Guidelines, 2010. MMWR 2010;59(No. RR-12):1-110.


Lindane shampoo and lindane lotion. US Food and Drug Administration website. Available at: http://www.fda.gov/Drugs/DrugSafety/PostmarketDrugSafetyInformationforPatientsandProviders/ucm110452.htm . Updated June 2009. Accessed July 9, 2009.


Medication guide lindane lotion. US Food and Drug Administration website. Available at: http://www.fda.gov/downloads/Drugs/DrugSafety/UCM133687.pdf . Updated August 2007. Accessed July 9, 2009.


Medication guide lindane shampoo. US Food and Drug Administration website. Available at: http://www.accessdata.fda.gov/drugsatfda%5Fdocs/label/2003/006309shampoolbl.pdf . Updated August 2007. Accessed July 9, 2009.


Pickering LK, American Academy of Pediatrics Committee on Infectious Diseases, et al. Red Book: 2006 Report of the Committee on Infectious Diseases . 27th ed. Elk Grove Village, IL: American Academy of Pediatrics; 2006.


Pubic "crab" lice fact sheet. Centers for Disease Control and Prevention website. Available at: http://www.cdc.gov/lice/pubic/factsheet.html . Updated May 2008. Accessed July 9, 2009.


Rapini RP. Parasitic infestations. American Academy of Dermatology website. Available at: http://www.aad.org/education/students/parainfest.htm . Accessed July 9, 2009.


Revised lindane lotion label. US Food and Drug Administration website. Available at: http://www.accessdata.fda.gov/drugsatfda%5Fdocs/label/2003/006309lotionlbl.pdf . Accessed July 9, 2009.


Revised lindane shampoo label. US Food and Drug Administration website. Available at: http://www.accessdata.fda.gov/drugsatfda%5Fdocs/label/2003/006309shampoolbl.pdf . Accessed July 9, 2009.

 

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